Die experimentelle Umsetzung der Modalkraftsimulation verteilter dynamischer Lasten unter besonderer Beruecksichtigung struktureller Nichtlinearitaeten

Advanced space systems, due to the increasing tendency toward extreme lightweight design and growing size, require new methods for experimental verification of the construction and design. In particular in structure dynamic qualification, one is looking for new methods as an alternative to the previously common single-axis sine dwell tests, which simulate the dynamic loads only inadequately. With modal force simulation one presents a new concept which permits to simulate the dynamic loads on a payload caused by excitation input at base by an arrangement of individual forces. The forces substituted for the inertial forces acting on the structure as a result of a base acceleration are determined so that they cause almost the same structure responses. This is possible by combining so-called modal forces, designating force distributions for purposeful acceleration of natural oscillation modes. Two different versions of the concept are presented. (orig.)SIGLEAvailable from TIB Hannover: H95B1649 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman